https://developer.apple.com/help/app-store-connect/configure-in-app-purchase-settings/generate-a-shared-secret-to-verify-receipts
View or generate a shared secret for all your apps (primary shared secret)
From the homepage, click Users and Access.
Click the Integrations tab.
In the sidebar under Keys, click Shared Secret.
Click Generate Primary Shared Secret.
Copy the code and use it for your transactions receipt for all of your apps with auto-renewable subscriptions.
When you generate a new shared secret, all apps in your organization that use a shared secret should use the new value to verify auto-renewable subscriptions.
mo.ag
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I'm also facing exactly the same issue. Hope team Apple will resolve it soon.